Improvement in boiler-tube scrapers



R. LAPHAM.

BOILER TUBE SCRAPER.

Patenteg April 11, 1876.

ERS. .FHOTQLITHOGRAPMER. WASHINGTON, u c

UNI ED STATES PATENT Orrron.

RUFUS LAPHAM, on NEW YORK, N. Y.

[MPROVEMENT IN BOILER-TUBE SCRAPERS.

Specification forming part of Letters Patent No. 175,836, dated April11, 18%; application filed September 7, 1875.

To all whom it may concern:

Be it known that I, RUFUS LAPHAM, of New York, in the county and Stateof New York, have invented certain new aud valuable Improvements inBoiler-Tube Scrapers; and I do hereby declare that the following is afull, clear, and exact description of the same,

reference being bad to the accompanying drawing, and to the letters ofreference marked thereon.

The object'of the invention is to provide a better and more thoroughdevice for cleaning boiler-tubes than has before been produced; and thenature of the invention is described in detail below.

In the accompanying illustration, Figure l is an elevation of aboiler-tube scraper embodying my invention. Fig. 2 is a longitudinalsection of the same, and Fig. 3 is a plan or top view.

Similar letters of reference indicate corresponding parts.

a is the rod upon which the tube'cleaner is placed. bis a bolt screwinginto the end of the rod to. c is a shell inclosing a spiral spring, d,and protectingit from the flames and heat. f is a hub, and, made in thesame piece, isa tube, 9, which runs on the bolt 12. The shell 0 fitsover and upon the tube 9 and makes a tight joint, and the spring 01rests against the end of the tube 9 and against the shell 0. h h arearms hinged to the hubfby means of pins k. By means of pins 1 the armshare hinged to the arms m, which are hinged at force the tube 9 againstthe spiral spring 01,

which is inside the shell 0; and the pressure of the spring keeps thescraping-edges m firmly and evenly against the inside of the tube,cleaning it thoroughly.

The scraper may be easily made more or less stiff by turning the bolt1), which screws into the rod a, thus contracting the spring andpressing it hard against the tube 9, or

allowing it .to expand.

It will thus be seen that the tube-scraper herein described is perfectlyand easily adjustabie, while the spring is well protected and inclosedfrom flames and heat.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

The combination of the spring 01, tube 9,

and shell 0, for the purpose of providing a,

tight chamber and protected spring, as and for the purpose hereinbeforeset forth.

RUFUS LAPHAM. Witnesses:

HENRY W. WILLIAMS, R. A. GEORGE.

